package com.like.sortlist;


import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.graphics.drawable.ColorDrawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

import com.like.likeutils.R;

/**
 *
 * 右侧的字母索引View
 *
 * @author
 *
 */

public class SideBar extends View {

	// 触摸事件
	private OnTouchingLetterChangedListener onTouchingLetterChangedListener;

	// 26个字母
	public static String[] b = { "#", "A", "B", "C", "D", "E", "F", "G", "H",
			"I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
			"V", "W", "X", "Y", "Z" };
	// 选中
	private int choose = -1;

	private Paint paint = new Paint();

	private TextView mTextDialog;

	/**
	 * 为SideBar显示字母的TextView
	 *
	 * @param mTextDialog
	 */
	public void setTextView(TextView mTextDialog) {
		this.mTextDialog = mTextDialog;
	}

	public SideBar(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
	}

	public SideBar(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public SideBar(Context context) {
		super(context);
	}

	public void setSideBarBackgroundResource(int resId) {
		setBackgroundResource(resId);
	}

	/**
	 *
	 * 重写的onDraw的方法
	 *
	 */
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		int height = getHeight();// 获取对应的高度
		int width = getWidth();// 获取对应的宽度
		int singleHeight = height / b.length;// 获取每一个字母的高度
		for (int i = 0; i < b.length; i++) {
			paint.setColor(Color.rgb(33, 65, 98));
			paint.setTypeface(Typeface.DEFAULT_BOLD);
			paint.setAntiAlias(true);
			paint.setTextSize(20);
			// 选中的状态
			if (i == choose) {
				paint.setColor(Color.parseColor("#3399ff"));
				paint.setFakeBoldText(true);// 设置是否为粗体文字
			}
			// x坐标等于=中间-字符串宽度的一般
			float xPos = width / 2 - paint.measureText(b[i]) / 2;
			float yPos = singleHeight * i + singleHeight;
			canvas.drawText(b[i], xPos, yPos, paint);
			paint.reset();// 重置画笔
		}
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent event) {

		final int action = event.getAction();
		final float y = event.getY();// 点击y坐标
		final int oldChoose = choose;

		final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;

		final int c = (int) (y / getHeight() * b.length);// 点击y坐标所占高度的比例*b数组的长度就等于点击b中的个数

		switch (action) {
			case MotionEvent.ACTION_UP:
				setBackgroundDrawable(new ColorDrawable(0x00000000));// 设置背景颜色
				choose = -1;
				invalidate();
				if (mTextDialog != null) {
					mTextDialog.setVisibility(View.INVISIBLE);
				}
				break;

			default:
				setBackgroundResource(R.drawable.sidebar_background);
				if (oldChoose != c) {
					if (c >= 0 && c < b.length) {
						if (listener != null) {
							listener.onTouchingLetterChanged(b[c]);
						}
						if (mTextDialog != null) {
							mTextDialog.setText(b[c]);
							mTextDialog.setVisibility(View.VISIBLE);
						}
						choose = c;
						invalidate();
					}
				}
				break;
		}

		return true;
	}

	/**
	 * 向外松开的方法
	 *
	 * @param onTouchingLetterChangedListener
	 */
	public void setOnTouchingLetterChangedListener(
			OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
		this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
	}

	/**
	 *
	 * 接口
	 *
	 * @author
	 *
	 */
	public interface OnTouchingLetterChangedListener {
		public void onTouchingLetterChanged(String s);
	}

}
